CODEWITHSUNDEEP
c#picturebox
locknies
locknies

Reputation: 1355

Saving Image From Picturebox

Iam drawing an image to a picturebox. I resize the image in the picturebox as per the width and height to fit it correctly in picutrebox. After that i want to save it, while saving it i also want to save the non image drawn part too in the saved file. Please see the screenshot, in the screenshot i have 2 white portions marked 'X'. when i save the image in picturebox i also want to save the blank portion too (place corssed in red) as either transparent .png or solid white .jpg.

Actually i copied some parts of the code from google and modified. It will be great and so much helpful if someone please explain it line by line.

enter image description here


THis is what i have donw so far,

private void button1_Click(object sender, EventArgs e)
    {
        OpenFileDialog open = new OpenFileDialog();
        open.Filter = "Image Files(*.jpg; *.jpeg; *.gif; *.bmp;  *.png)|*.jpg; *.jpeg; *.gif; *.bmp; *.png";
        if (open.ShowDialog() == DialogResult.OK)
        {               
            Image original = Bitmap.FromFile(open.FileName);
            pictureBox1.Image = new Bitmap(ScaleImage(original));

            pictureBox1.Padding = new Padding((pictureBox1.Width - ScaleImage(original).Width) / 2, (pictureBox1.Height - ScaleImage(original).Height) / 2, 0, 0);
        }
    }

    private Bitmap ScaleImage(Image oldImage)
    {
        double resizeFactor = 1;

        if (oldImage.Width > 300 || oldImage.Height > 300)
        {
            double widthFactor = Convert.ToDouble(oldImage.Width) / 300;
            double heightFactor = Convert.ToDouble(oldImage.Height) / 125;
            resizeFactor = Math.Max(widthFactor, heightFactor);
        }

        int width = Convert.ToInt32(oldImage.Width / resizeFactor);
        int height = Convert.ToInt32(oldImage.Height / resizeFactor);
        Bitmap newImage = new Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);

        newImage.MakeTransparent(Color.White);

        Graphics g = Graphics.FromImage(newImage);

        g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
        g.DrawImage(oldImage, 0, 0, newImage.Width, newImage.Height);
        return newImage;
    }
    private void button2_Click(object sender, EventArgs e)
    {
        pictureBox1.BackColor = Color.White;
        pictureBox1.Image.Save("D:\\temp.png", ImageFormat.Png);
    }

Upvotes: 0

Views: 8172

Answers (1)

Matyas
Matyas

Reputation: 1172

I hope that this might help. Try to use it to save the resized image (in button2_Click I guess).

using (Bitmap bitmap = new Bitmap(pictureBox1.Width, pictureBox1.Height))
{
    using (Graphics graphics = Graphics.FromImage(bitmap))
    {
        graphics.Clear(Color.Transparent);
        graphics.DrawImage(pictureBox1.Image, (bitmap.Width - pictureBox1.Image.Width) / 2, (bitmap.Height - pictureBox1.Image.Height) / 2);
    }

    bitmap.Save(@"D:\tmpMod.png", ImageFormat.Png);
}

Upvotes: 3

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